Furnace-grate.



S. THURSTENSEN.

FURNACE GRATE.

APPLICATION man JULY 31.1916` Patented Jan. 28,1919.

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@www .l H-H-H-H N S. THURSTENSEN.

FURNACE GRATE.

APPLICATION FILED JULY 31,1916. 1,292,923, Patented Jan. 28,1919.

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FURNACE GRATE. APPLICATION FILED JuLY 31.1916'.

Patented J an. 28, 1919.

3 SHEETS-SHEET 3- sections which are oscillata STATES PATENT OFFICE.

SOEEN THUBSTENSEN, OF LOUISVILLE, KENTUCKY, ASSIGNOB TO HENRY VOGTMACHINE COMPANY. OF LOUISVILLE, KENTUCKY, A CORPORATION OF KENTUCKY.

FURNACE-GBATE.

'Specification of Letters Patent.

Patented Jan. 28, 1919.

Application illed July 31, 1916. Serial No. 112,304.

Be it known that'I, SoREN .lHUms'rnNSEN,

a citizen of the United States residing at Louisville in the county ofJzelerson and State of kentucky, have invented certain new and usefulImprovements in Furnace- Crates, of which the following is aspecicat1on.

In the construction of familiar types of furnace gratos, there areprovided grate ly mounted in suitable bearings, so that they can berocked about horizontal axes. In the ordinary operation of shaking downthe grate, lthese sections are oscillated back and forth substantiallyequal amounts on both sides of the central or normal position. When itis desired to dump the grate, the grate sections are rocked anadditional amount in the dumping direction, so that their upper or ratesurfaces are thrown into substantial y vertical positions. The variousgrate sections are mountedlin suitable bearings, which bearings in turnare formed in horizontal bars lymg at right angles to the direction ofthe grate bar sections. Ordinarily the grate bar sections extend acrossthe furnace and the bearing bars extend from front to rear. It iscustomary to provide one of these bearing bars at each side of the furnace. When the furnace is so -wide as to make it undesirable to usegrateV bars of full width, the furnace is divided up into two or moresections. Each of these sections is of less width than the width of thefur' nace, and su porting barsare mounted between the adjacent edges ofconsecutive sections. These supporting bars provide bear- 1iDngs for theinner ends of the adjacent grate ars. v

n In all previous constructions of grate with which I am familiar noattempt has been made to carry the ate bars over the bearings ofthesupportmg bars, so that the said bearings have been exposed to theintense heat of the fuel bed. Furthermore this omission in previousforms of construction has resulted in the provision of an uneven gratesurface, there being depressions or openings in the surface of the grateat the points where the bearings are located. Coal and ashes necessarilyaccumulate in these openings, and this Vtends to jam the bars so thatthey cannot be readily rocked.

One of the objects of the present invention is to provide a constructionof grate in which the said bearings will at all times bte covered overand protected by grate sectlons, so that when the grate bars arestanding in their central or normal osition there w1ll be presented apractical y continuous rate surface throughout the entire area of t efurnace. This will prevent the coal and ashes from having Vdirectcommunication with the bearings, and at the same time will largelyovercome the aforementioned dif# ficulty and objection, due to thejamming of the grate bars when they are being oscillated.

Another feature of the invention has to do with the manner in which thegrate bars are built up. In this connection one object is to provide asectional grate bar which can be built up from a minimum number of partsto the desired size, all of the parts being of standard form andconstruction.

Other objects and uses of the invention will appear from a detaileddescription of the same which consists vin the features of constructionand combinations of parts hereinafter described and' claimed.

Referring .to the drawings:

vFigure 1 shows a plan view of a grate embodying the features ofthepresent invention, said ate comprising two sections lying side byslde with an intermediate bearing bar, the central portion of one of thesections being broken awa for the purpose of reducing the width of t efigure;

Fig.y 2 shows a longitudinal section taken on the lineA2-2 of Fig. 1,looking in the direction of the arrows;

Fig. 3 shows a side elevation of one of the rocking bars with the gratesections in place, the upper portions of the grate sections bein brokenaway for the purposes of convenience and illustration; Fi 4 shows a planview corresponding to Flg. 3, with the exception that the grate sectionshave been removed in their entiret Fig. 5 shows a cross section taken ont e line 5-5 of Fig. 1, Looking in the direction of the arrows, Fig. 5bemg on a smaller scale than Fig. 1;

Fig. 6 Ishows a cross section taken on the line 6-6 of Fig. 3, Iookinginthe direction of the arrows;

Fig. 7 shows a horizontal lsection taken on the line 7 7 of Fig. 6,looking in the the numeral 12 and the bridge wall by the numeral 13. Inthe construction illustrated the furnace is of such width that two gratesections are used, the same being mounted side by side and beingdesignated by the numerals 14 and 15. Each of these sections runs thefull depth of the furnace, although manifestly, if desired, each gratesection might be constructed to occupy only a portion of the depth ofthe furnace, the number of sections being multiplied accordingly.

In like 'manner a greater or lesser number of sections may be usedacross the width of the-furnace according to the requirements of theparticular construction in hand.

Each grate section is built up from one or more bars 16 on which aremounted the leaves 17. The end portions of each bar 16 are suitablyjournaled. In the construction illustrated, this journal is eil'ected bymeans of the side bars 18 and 19, and the center bar 20, the center barserving to support the inner ends ofall of the grate bars. l"Each gratebar is provided with a downwardly depending lug 21, and all of the gratebars of each sectlon are joined together by a rocking bar 22 which canbe swung back and forth by means of a handle 23 in the usual manner. l

Each grate bar 16 is preferably formed of greater depth than its width,and its central portion may be cut away to provide -an elongated slot oropening 23a. This will lighten the bar without materially detractingfrom its mechanical strength. The side portions of each grate bar areprovided with the vertical slots or grooves 24 formed in pairs onopposite sides of the bar. These pairs of slots or grooves accommodatethe arms 25 and 26 of the leaves in the manner indicated in Figs. 3, 4,6 and 7. When all of the leaves have been set in position on a gratebar, they may be locked in such position by means of a rod 27. This rodextends between grooves 28 formed in the leaves, and grooves 29 formedin the side portion to remove any leaf without first withdrawi ing therod 27.

The upper portions 'of the leaves are of l greater width than theirdepending lug portions 25 and 26, and said upper portions are serratedas particularly shown in Fig. 1.

Upon osclllating any given grate bar, all

of itsleaves will'bel swung back and forth,

while the end portions of the grate bar oscillate within the bearings ofthe center and side bars.

An examination of. Fig. 1 in particular shows that the space occupied bythe center v bar 20 is substantially equal to that occu. pied by a rowof leaves extending from front to rear of the furnace, and suchexamination will also show that the furnace width occupied by each ofthe side bars 18 and 19 is substantially eoual to one-half the width ofva row of`leaves. Consequentlyl unless some means is provided forprotecting the center and, side bearing bars, a very considerableportion of the furnace area will be left unoccupied by any of the grateleaves. In order to remedy this deficiency, I have provided 'theconstructions which I will now describe.

Reference particularly to Figs. 2, 5, and 8 will disclose the fact thatvthe bearings are i portions '32 and 33 of the grate bars arel roundedand rest within the U-shaped bearings thus provided. A stationary capsection 34 is seated over each -of the bearings and serves not only tocover over and close the same, but also servesl to restore the .con-Atinuity of the upper surface of the grate when all the bars stand intheir central positions. Each of the stationary leaves is provided withdownwardly depending side lugs 35 and 36 which embrace between them 'theupstanding lugs 30 and 31 of the bearing bar. It will be observedparticularly from an examination of Fig. 8 that the side faces of thelugs 30 and 31. both slant in one direction, the lugs 35 and 36 beingsimilarly formed. A key 37 may be driven home between a keyway 38 formedin the lug 31 and a notch 39 formed in the lug 36. When the sald key isdriven home, it will be impossible for the lug 36 to rise along the lug31, and by reason of the outward pitch of the lug 30 1t will beimpossible for the lug 35 to rise across the face of the lug 30 untilthe key -37 has been withdrawn'.

Those stationary leaves which are mounted on the center bearing bar areof a contour s1m1lar to the contours of the leaves mounted on the-gratebars-that is, they are serrated lwalls of the furnace.

l/Vhile I have herein shown and described -only a single construction offurnace grate embodying the features of my invention, still it will beunderstood that I do not limit myself to the said construction except asI may do soin the claims.

1. In a furnace, the combination of s aced bearing bars arranged inparallel re ation and having on their upper portions upwardly extendingpairs of spaced lugs affording journal bearings, rocking rate barshaving end journals resting in sait? bearings and having rate surfaceson their upper portions, `an cap sections on` the journal bearingsinclosing their upper portions, each cap section having a pair ofdepending side lugs Iadapted to embrace the side lugs of thecorresponding journal bearing, the coactin -faces of each Iset ofengaging lugs on bot sides of the bearing being all pitched insubstantially the same oblique ldirection, whereby the backward itch ofthe' lug on one side of the journal caring will interlock with thecoacting lug of the corresponding cap section, and a key interengagingthe opposite pair of lugs for maintaining the interlock, substantiallyas described.

2. In a furnace, the combination of s aced bearing bars arranged inparallel re ation and having on their upper portions upwardly extendingpairs of spaced lugs affording journal bearings, rocking grate barshaving end journals resting in sal bearings and having rate surfaces ontheir upper portions, am? cap sections on the journal bearings inclosingtheir upper portions, each cap section having a pair of depending sidelugs adapted to embrace the side lugs of the corresponding journalbearing, the coacting faces of each set of engaging lugs on both sidesof the bearing bein all pitched in substantially the same oliquedirection, whereby the backward pitch of the lug on one side of thejournal bearin will interlock with the coacting lug o the correspondingcap section, and a key interengaging the opposite pair of lugs formaintaining the interlock, each cap section having its upper surface ofcontour similar to the contour of the grate surfaces of the adjacentrocking sections` and continuous therewith when the rocking sectionsstand in their normal position, substantially as described.

3. In a furnace, the combination of spaced bearing bars arranged inparallel relation and having on theirA upper portions upwardly extendingpairs of spaced lugs affording journal bearings, rocking grate barshaving end journals resting in said bearings, a series of grate leavesfor eachv grate bar, having grate surfaces on their upper faces andhavin arms embracing the sides of the bar, a loc ing rod for each gratebar jointly engaging portions of the arms and the portions of the gratebar for locking the leaves to the grate bars, and cap sections on thejournal bearings inclosing their upper portions, each cap section havinga pair of depending side lugs adapted to embrace the side lugs of thecorresponding journal bearing, the coacting faces of each setof engaginlugs on both sides of-'the bearing being all pitched in substantiallythe same oblique direction, whereby the backward pitch of the lug on oneside of the journal bearing will interlock with the coacting lug of thecorresponding cap section, and a key interengaging the opposite pair oflugs for.

maintaining the interlock, substantially as described.

4. In a furnace, the combination of spaced bearing bars arranged inparallel relation and having on their upper portions upwardly extendingpairs of spaced lugs affording journal bearings, rocking grate bars`having end journals resting in said bearings, a series'of grate leavesfor each grate bar, having grate surfaces on their upper faces and havinarms embracing the sides of the bar, a locking rodl for each grate barjointly engaging portions of the arms and portions of the grate bar forlocking the leaves to the grate bars, and cap sections'on the journalbearings inclosing their upper portions, each cap section having a pairof depending side lugs adapted to embrace the side lugs of thecorresponding journal bearings, the coacting faces of each set ofengaging lugs on both sides of the bearings being all pitched insubstantially' the same oblique direction, whereby the backward pitch ofthe lug on one side of the journal bearing will interlock with thecoacting lu of the corresponding cap section, and aey inter-engaging theopposite pair of lugs for maintaining the interlock, each cap sectionhaving its upper surface of contour similar to the contour of the gratesurfaces of 'the adjacent locking sections and continuous therewith whenthe locking sections stand in their normal position, substantially asdescribed.

lSOR-EN THURSTENSEN.

Witnesses:

B. F. KUBAUGH, S. MULTHALL.

